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Trade New Holland hit& miss engine 1/2 HP 1/3 scale

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Nov 14, 2018
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Comstock Park
Hi I was just gifted this engine from someone who has seen my other steam models. At some point I was thinking about building a hit and miss engine. As the one that I got it is in great shape, just older and dusty I'm thinking about restoring it. Should I ?? Do you know where I can get a full set of plans for this engine. I know ZERO about this model, Where can I learn more, as in fuel, how is it powered etc. Tuning, adjusting Thanks for any leads any one can help me with. I want 20220609_104038.jpg to learn as much as I can.20220609_104108.jpg20220609_104015.jpg


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It looks like a Paul Briesch design, judging from the cast "B".

It looks to be in pretty decent condition.
I am not sure about the cotterpin in photo 104111; that does not look to be correctly positioned.

I have not run an IC model engine, but I have heard the term "white gas", or "Coleman" fuel used for powering them, and sometimes other mixtures of liquid fuel (occasionally propane powered).

All IC engines operate in a very similar fashion, so I don't think you need the exact drawings for your engine to figure out its operation.
There is a great deal of knowledge here about IC engine operation, so I don't see a problem as far as getting the help you need to run it.

The bright surfaces can be buffed out pretty easily.

In my opinion, this would seem to be an easy restore, and a pretty nicely built engine.

The patina on the brass/bronze parts looks pretty nice, so you could leave that as-is, or buff all of that bright too.

Hi, Martin
The ignitor trip and spring is missing.
The round thing, with the tubing makes me think that it was ran on propane.
A lot of people ran them on propane because it was so hard to get them to run on gas. These have a vapor mixer.
The surface area in the fuel tank is so small, it is hard to get the fuel vapor quantity for the engine to run. This is a Briesch 1/4 scale.
OK I will scour this site and other to find out about these things. "The ignitor trip and spring is missing " the problem is -I don't know what I don't know. That is why I am looking for plans. As I am late to the game,some of the common things known to most are still foreign to me for now. I am a newly retired tool & die-maker so learning is no problem. It's just finding the specifics for this model. Seems it is a well liked model,just light on the info.
Thanks for the help. Keep it coming. Why does this not look right? What is the adjustable cup for?20220609_104254.jpg
Assuming your model is like the full sized engines, you can see how these engines operate by watching videos.

This video is a bit blurry, but I think I can see the ignitor trip rod.

Here is a better video:

Wonderful. The bronze casting with the wire attached is the igniter correct? I will have to find out more about this part and how the moving parts levers and such work now and the impact any adjustments.
I am stymied by the fuel delivery system20220609_104027.jpg
20220609_104217.jpg What is this all about? Looks looks something drains from it, into the trough and then down a pipe?
Next problem. My entire sphere of knowledge of electricity consists of Black or Red or + or -. That is it.I can build large or small dies and any tooling using just using real prints, cot cad parts by hand.But holding two wires in my hand and knowing how they work is magic to me.
So take a look at what I was left with. I know WHERE they hook to engine. But not which where. and how does a battery figger' into all this/


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I see that there is a propane pressure regulator.
The engine was being fueled by propane.

As far as the wiring, positive to the switch through the coil to the post on the head.
The terminal on the head should be insulated.
Then ground to the base of the engine.
That all depends, do you have any small lead acid batteries, 3v,6v or battery trays to hold multiple dry cell batteries?
Some people use their cordless tool battery. I don't know what the coil that you have can handle, you'll have to check to see if it gets hot.

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